package com.kuang.servlet;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

//        this.getInitParameter()   初始化参数
//        this.getServletConfig()   Servlet配置
//        this.getServletContext()  Servlet上下文
        ServletContext context = this.getServletContext();
        String username = "小明";
        context.setAttribute("username",username);//将一个数据保存在了ServletContext中，名字为：username. 值 username
        System.out.println("Hello_world");
    }
}
